Re: [Xen-users] graphic card on domU

[Abe <lynchbay@xxxxxxxxx>]

On 3/15/07, Petersson, Mats <Mats.Petersson@xxxxxxx> wrote:
> > what exactly do you mean by "drm"?
>
> "Direct Rendering Module" - the X-windows kernel modules to support
> differnet graphics cards using "DRI" (Direct Rendering Infrastructure".
>
> > I am not in concern for the *VGA* state, it can easily be reset.
>
> Yes, but if you're working in graphics mode (X) and the Dom0 decides to
> write to the VGA controller, your graphics card may not "appreciate" it.
> Since there's no direct communication between the DomU and Dom0 about
> what's going on in the different "world", the context of the graphics
> card may be severely damaged by performing VGA writes to a graphics
> context (or the other way around).
>
> So you need Dom0 to "give up" it's VGA ownership if you want DomU to
> access the graphics card. And that's not going to be easy. The only
> (easy) solution is to have two graphics cards and giving the SECOND one
> to DomU.
maybe in xen-devel they'll know what to do in order to remove the VGA
from domain0, for instance, blocking the graphic adapter at the
hypervisor level. the FB can be removed using a compile flag or
something and the console output could be redirected to a serial
port...

thanks,
Abe

> --
> Mats
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